1643135156 has 12 divisors (see below), whose sum is σ = 3096677892. Its totient is φ = 758370048.

The previous prime is 1643135149. The next prime is 1643135189. The reversal of 1643135156 is 6515313461.

It can be written as a sum of positive squares in 2 ways, for example, as 821395600 + 821739556 = 28660^2 + 28666^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15799325 + ... + 15799428.

It is an arithmetic number, because the mean of its divisors is an integer number (258056491).

Almost surely, 2^1643135156 is an apocalyptic number.

It is an amenable number.

1643135156 is a deficient number, since it is larger than the sum of its proper divisors (1453542736).

1643135156 is a wasteful number, since it uses less digits than its factorization.

1643135156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31598770 (or 31598768 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

The square root of 1643135156 is about 40535.6035603271. The cubic root of 1643135156 is about 1180.0246944942.

The spelling of 1643135156 in words is "one billion, six hundred forty-three million, one hundred thirty-five thousand, one hundred fifty-six".